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yfz450r

  1. Raptors & YFZ450
    hi guys i need help with my quad .. it's a 450r 09 special edition , just got my motor rebuild , rebuild crank , ported head , 12.4 high compression piston and i got a rs-2 aluminium yoshimura exhaust , the rest is stock .. he make that sounds since the rebuild and we just can't figure out...
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